Merge branch 'bpf-add-bpf_ksock_sendto-kfunc'

Mahe Tardy says:

====================
bpf: Add bpf_ksock_sendto() kfunc

This patch series improves the bpf_ksock infrastructure in line with the
work proposed during Prague Plumbers 2026 presentation[^1] by adding
the bpf_ksock_sendto() kfunc to complement the bpf_ksock_send().

This is useful when using ksock to reply to differents peers while
reusing the same UDP socket and generally works toward the goal of ksock
to support the basic socket operations.

[^1]: https://lpc.events/event/20/contributions/2430/

v2 updates:
- remove the LSM verifier filter refinements (alexei)
- remove allowing calling connect() from the send path (alexei)
- change order of the tests patches for signature definition (sashiko)

v1: https://lore.kernel.org/bpf/DM9RCU3BDWEG.1C32ZIVU95S76@gmail.com/
====================

Link: https://patch.msgid.link/20261020155848.75711-1-mahe.tardy@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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